/usr/share/php/Symfony/Component/Security/Core/Authentication/Provider/ is in php-symfony-security-core 3.4.6+dfsg-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/php/Symfony/Component/Security/Core/Authentication/Provider/AnonymousAuthenticationProvider.php
/usr/share/php/Symfony/Component/Security/Core/Authentication/Provider/AuthenticationProviderInterface.php
/usr/share/php/Symfony/Component/Security/Core/Authentication/Provider/DaoAuthenticationProvider.php
/usr/share/php/Symfony/Component/Security/Core/Authentication/Provider/LdapBindAuthenticationProvider.php
/usr/share/php/Symfony/Component/Security/Core/Authentication/Provider/PreAuthenticatedAuthenticationProvider.php
/usr/share/php/Symfony/Component/Security/Core/Authentication/Provider/RememberMeAuthenticationProvider.php
/usr/share/php/Symfony/Component/Security/Core/Authentication/Provider/SimpleAuthenticationProvider.php
/usr/share/php/Symfony/Component/Security/Core/Authentication/Provider/UserAuthenticationProvider.php